I wrote a trends post on Coupon Marketing for 2013 for SmallBizTrends. I talk about how companies like Groupon are evolving their business model with resources to help merchants like GrouponWorks and what I think the evolution of coupon marketing will look like in 2013. Take a look and comment there on the article at SmallBizTrends.
On another note hope you saw my post on SheerID talking about Couponless Marketing published by Techcocktail.
Of course if you want another way to send a treat read my post on Treater.